List of top Questions asked in GATE PI- 2021

A cylindrical mild steel tensile test specimen of gauge length 50 mm and diameter 10 mm is extended in two stages at a deformation speed of 4 mm/min. The specimen is extended from 50 mm to 55 mm in the first stage, and from 55 mm to 60 mm in the second stage. Neglecting elastic deformation, the total longitudinal true strain is _________.
\text{[round off to 2 decimal places]}
A M30 bolt needs to be subjected to pretension \( F_1 = 350 \, \text{kN} \). If the torque coefficient \( K \) of the bolt is 0.2, then the torque in Nm needed to achieve this pretension is _________.
\text{[in integer]}
A 150 mm wide polyamide flat belt is transmitting 15 kW power through a belt-pulley system. The driving pulley of 150 mm pitch diameter is rotating at 200 RPM. If \( F_1 \) is the belt tension on high tension side, and \( F_2 \) is the belt tension on low tension side, then the difference in belt tensions \( \Delta F = F_1 - F_2 \) in N is _________.
\text{[round off to one decimal place]}
The dimensionless number defined by the ratio of inertial force to viscous force is called
A small capillary tube of 3 mm inner diameter is inserted into a fluid having density 900 kg/m\(^3\), surface tension 0.1 N/m, and contact angle 30°. The rise in the height of fluid in the capillary tube due to surface tension is
The frequency of pulsing in a die-sinking electric discharge machine (EDM) is 10 kHz. The pulse off-time is set at 40 micro-seconds. The duty factor at this setting is
Pearlite microstructure in an eutectoid steel consists of alternating layers of two phases, namely \( \alpha \) ferrite and
Which one of the following defects is NOT associated with welding processes?
In a turning operation, doubling the cutting speed \(V\) reduces the tool life \(T\) to \( \frac{1}{8} \) of the original tool life. The exponent \(n\) in the Taylor’s tool life equation, \( V T^n = C \), is
Which one among the following mechanisms is NOT used for transforming rotation to translation in machine tools?
When acceptance number of a single sampling plan under attribute category is zero with sample size less than or equal to 10, the Operating Characteristic (OC) curve is
Which one of the following is an improvement type heuristic algorithm for computerized layout design technique?
Which one of the following is NOT a measure of forecast error?
A product has an exponential time-to-failure distribution with a constant failure rate of 0.00006 per hour. The reliability of the product after 4000 hours of operation is
In a typical product development process under concurrent engineering approach, all elements of product life cycle from conception to disposal are considered at